Paper bag and closure therefor



Aug. 1, 1933.

Jul

J. A. ROSMAIT PAPER BAG AND CLOSURE THEREFOR Filed June 5. 1931 3 Sheets-Sheet l INVENTOR.

C/o/m A Fosmm't MXW ATTORNEYS.

Aug. 1, 1933. J. A. RosMAlT PAPER BAG AND CLOSURE THEREFOR Filed June 5, 1951 3 Sheets-Sheet 2' INVENTQR. c/ohn A. Fosmait' BY film/2W ATTORNEYS.

1933- J. A. ROSMAIT v 1,920,320

PAPER BAG AND CLOSURE THEREFOR Filed June 5, 1931 3 Sheets-Sheet 3 il m INVENTOR.

My/W

ATTORNEYS.

Patented Aug. 1, 1933 UNITED STATES 1.920.320 PAPER. BAG AND CLOSURE rnnnnron John A. Rosmait,

Filer Fibre Company, poration of Michigan Application June 5, 1

7 Claims.

My invention relates to improvements in paper bags and closures therefor.

It is particularly intended to be applied to paper bags having multiple walls and wherein anywhere from two to three plies of paper are used. Such.

bags are employed as containers for many things, but my invention is primarily directed to provide a bag of this character with a closure which will effectively seal the bag so that it may be used' 10 as a container for powdered material, such as cement or the like.

The invention is adaptable for use with either the valve type of bag or the open end type of bag and pertains particularly to the closure of the bag. I contemplate stitching the side walls of the bag together at the ends. If the" bag is of the valve type both ends are stitched together and sealed before the bag is filled. If the bag is of the open end type one end is left open until after the bag has been filled and this end is then stitched and sealed.

My invention contemplates the combination with the stitching of a sealer strip which seals the end of the bag and also the perforations caused by the stitching through the side walls of the bag. This sealer strip may serve as a reinforcement strip on oneor both side walls of the bag, being secured thereto by the stitching, in which capacity it serves to prevent the stitching tearing through the side wall of the bag structure.

I prefer to have the sealer strip serve as a reinforcement on the top or plain stitched side of the sewed seam only, and on the opposite side wall of the bag the sewed seam is in the form of a chain stitch which provides sufficient area and flexibility to prevent tearing through the side wall of the bag. The sealer strip is folded upon itself over the stitching which secures it to one side wall of the bag and over the end of the bag, and down along the opposite side wall over the line of stitching.

A meritorious characteristic resides in the particular form of adhesive securement of the sealer strip to the side walls of the bag and over the end 45 thereof. This strip is so adhesively secured to the bag as to prevent leakage either from the end of the bag or through the perforations through the side walls produced by the stitching.

Preferably it is secured to each side wall of the bag along and below the line of stitching by a line of adhesion and further secured by spaced apart narrow transverse lines of adhesive extending over the end of the bag and over the line of stitching on both sides of the bag. This particular type of adhesion secures the sealer strip in Manistee, Mich, assignor to Filer City, Mich, a Cor- 931. Serial No. 542,321 (01. 229-620 place in such a fashion that diflerent sections thereof are boxed on from each other. It might be said that the sealer strip was secured to the bag by a series of bulkheads formed by the adhesive whereby if leakage of the contents of the bag occurred at any point such leakage would not spread beyond the particular bulkhead portion within which it occurred.

It will be further noted that the lines of adhesion which extend transversely of the bag and parallel to the line of stitching do not superimpose the line of stitching. superimposing the line of stitching with adhesive renders the stitching inflexible by the adhering glue and tends to cause breakage upon handling the bag after the bag has been filled.

My improved closure is characterized by the fact that the closure strip terminates at the edges of the bag and the stitching itself is sealed by permitting the stitching thread to continue 7 beyond the edge of the bag and then turning the end back and adhesively securing it in place. This turned back end of the stitching may be secured in place adjacent a side wall of the bag and underneath the sealer strip, or it may be secured within the gusset formed in the side wall.

Various other advantages and important features of my improved bag structure will appear from the following specification, appended claims, and accompanying drawings, wherein:

Fig. 1 is a side elevation of the bag embodying my invention showing a portion of the sealer strip unfolded.

Fig. 2 is a fragmentary elevation of an end of the bag showing a portion of the sealer strip 0 raised.

Fig. 3 is a vertical sectional view through the bag at one end.

Fig. 4 is an elevation of an end fragment of a bag showing certain layers removed.

Fig. 5 is a horizontal sectional view taken on line 5-5 of Fig. 4.

Fig. 6 is a vertical sectional view through a single wall bag embodying my invention.

Fig. 7 is a fragmentary end-elevation partly 10 in section of a modified form of my invention.

Fig. 8 is a fragmentary end elevation partly in section of one form of my invention showing a modification as to disposition of the end of the stitching.

Fig. 9 is a sectional view taken on line 9-9 of Fig. 8.

Fig. 10 is an end elevation of a bag embodying my invention showing the modification as to the sealer strip.

Fig. 11 is a vertical cross section taken on line 11-11 of Fig. 10.

In the drawings I have shown several modifled forms embodying my invention. The invention may be embodied either in a valve type bag or an open end bag, and either in a single wall bag or a multiple wall bag. In the multiple wall bag the plies may vary from two to five or more. For

cleamess and convenience in illustration, the several views show a minimum number of multiple walls except in Fig. 11, which shows five plies, and Fig. 6, which shows a single wall bag. In the multiple wall bag the wall sections are gusseted.

Whether the bag is of the valve type or the open end type the ends of the wallsv are stitched by a line of stitching which closes the ends of the bag. In the preferred form of my invention illustrated in Figs. 1 to 5, inclusive, I provide a paper bag the side walls of which may be indicated as 20. In Fig. 1 the bag has a valve 22 of conventional construction. A line or stitching 24 closes each end of the bag. A sealer strip 26 is employed to seal the end of the bag. This sealer strip is preferably secured to one side wall of the bag, as appears in Figs. 1 and 3, by the line of stitching 24. It is also secured to the same side wall of the bag by two parallel spaced lines of adhesive 28 arranged on opposite sides of the line of stitching. This sealer strip is then folded upon itself along the line 30 so as to fold over the end of the bag. The face of the sealer strip which folds against and over the end of the bag is provided with adhesive as shown in Figs. 1 and 2.

The sealer strip is of a width which will enable it to be folded over the end of the bag so as to cover the stitching" on both sides. It is provided with a line of adhesive 32 extending along the margin which is folded against the opposite side wall of the bag, and it is provided with a plurality of spaced apart narrow lines of adhesive 34 which extend transversely of the strip from the fold line 30 to the adhesive line 32. The sealer strip is shown in dotted line in Fig. 3 as it would appear before it is folded, and in Fig. 2 it is shown folded up over itself; and in Fig. 1 and in part of Fig. 2, and in solid line in Fig. 3, it is shown folded over the end of the bag and adhesively secured on both sides. The line of adhesive 32 engages the side wall of the bag below the stitch line and the narrow lines of adhesive 34 extend over the line of stitching on both sides of the bag and over the end of the bag and form what might be termed bulkhead portions enclosed by adhesive, which would prevent leakage of the contained material in the bag through the perforations formed by the stitching.

In this type of construction the sealer strip is sealed to one side wall of the bag by the plain stitch and on the opposite side of the bag the stitching is in the form of a chain stitch as is indicated in Figs. 3 and 5, and this chain stitch has substantial area and is quite flexible and serves to prevent very much leakage of powdered material through the perforations formed by the stitching. The sealer strip serves as a re inforcement strip on that side of the bag where it is secured thereto by the plain stitch and serves to prevent tearing or rupturing of the bag walls upon strain imposed against the line of stitchmg.

The sealer strip does not extend beyond the side wall edges of the bag and. therefore. there are no protruding portions to get in the way or to be torn loose.

An important feature of my invention is that, notwithstanding the elimination of the proiecting ends of the sealer strip, I accomplish the. sealing of'the stitching thread so as to prevent unravelling by allowing the stitching thread to project as appears at 36 in Fig. 1, and then tuming this portion 36 back along one side wall of the bag and securing it in place. In the construction shown in Figs. 1-5 this portion 36 is turned back-into the-gusset of the side walls as appears more clearly in Fig. 5. It is adhesiveiy secured between said gusseted side walls and in proximity to fold in the sealer strip over the end of the bag as appears in Fig. 2.

In Fig. 6 the invention is shown as applied to a bag having a single wall. The sewing of the bag and the securing of the sealer strip over the end thereof is as has been described. The pro- Jecting ends of the thread, however, may be secured in place in a different manner and this is shown in Figs. 8 and 9. In these figures of the drawings the projecting end of the thread is turned back against one side wall of the bag underneath the sealer strip 26, as shown particularly in Fig. 9, and adhesively secured in place at such point. Otherwise the construction is similar to that described in s. l-5 inclusive. The method of securing the end of the stitching in Fig. 9 may be applied to the construction shown in Fig. 6. In Figs. '1, l0, and 11 I have shown a somewhat different form of sealer strip. It will appear from the cross sectional views in Figs. 10 and 11 that the sealer strip 26 is secured by the stitching 24 to both side walls of the bag. This sealer strip is provided with a longitudinal line of adhesive spaced from the stitching as shown in Fig. 1 and it is also provided with the transverse lines of adhesive 34 extending over the top of the bag and to the lower longitudinal line of adhesive so as to form the bulkhead portions, but one or both margins of the sealer strip may be folded back over the line of stitching itself.

In Fig. '7 the sealer strip has a marginal portion which folds entirely over the end of the bag as described in connection with the construction shown in Figs. 1-5. This portion is provided with adhesive arranged as is set forth in the description of the construction shown in Figs. 1-5 and is sealed on in the same manner. The projecting end of the stitching may be secured in the gusseted portion aswas described in connection with the construction illustrated in Figs. 1-5 or it may be secured as shown in Fig. 9.

In Figs. 10 and 11 the sealer strip is folded back from both margins below the stitching over the line of stitching on the adjacent side of the bag. This folded back portion is. shown in Fig. 10 as provided with adhesive arranged as has been 135 heretofore described and the projecting ends 36 of the stitching are folded back and adhesively secured to one side wall of the bag in a suitable manner as has been heretofore set forth.

It will be noted that the transverse lines of 140 adhesive 34 are relatively narrow and that where they overlie the stitching they have a width which is not substantially greater than a single stitch so that they do not tend to render the stitching rigid throughout a substantial distance which would 145 have the eii'ect of probably causing breakage of means employed to fasten the bag walls together, and used alternately in place of the stitching and is to be so considered.

What I claim:

1. A paper bag having side walls secured together at one end by a line of stitching, a sealer strip secured to one side wall by said line of stitching, said strip folded upon itself over said line of stitching and thence extending over the end of the bag and down along the opposite side wall and adhesively secured to said opposite side wall spaced below the line of stitching by a longitudinal line of adhesive extending parallel to the line of stitching, said strip further secured in place by narrow spaced apart lines of adhesive extending transversely of the strip from the fold line thereof on one side of the bag below the line of stitching to said longitudinal line of adhesion thereof on the opposite side of the bag below the line of stitching.

2. A paper bag having its side walls secured together at one end by a line of stitching, an. end closure strip secured as a reinforcement over one side wall by said line of stitching and folded upon itself over said line of stitching and thence extending over the end of the bag and down along the opposite side wall and secured thereto by a longitudinal line of adhesion extending across said opposite side wall parallel to but spaced below said line of stitching, said strip further secured in place by a line of adhesive extending transversely across each end of the strip over the end of the bag and over the line of the stitching on both sides of the bag from said longitudinal line of adhesion of the strip to the bag on one side wall to the fold line of the strip on the opposite side wall.

3. A paper bag having side walls secured together at one end by a line of stitching, a reinforcing sealer strip extending across said end of the bag and secured to one side wall by said line of stitching, said sealer strip folded upon itself and thence extending over the end of the bag and down along the opposite side wall and secured thereto by a longitudinal line of adhesive extending across said opposite side wall below the line of stitching, said sealer strip further secured in place by spaced apart lines of adhesive extending transversely of the strip from said longitudinal line of adhesive on one side of the bag to the fold line of the strip on the opposite side of the bag, said transverse lines of adhesive each having a width not to exceed a. single stitch.

4. A paper bag having side walls secured together at one end by a line of stitching, a sealer strip secured as a reinforcement to one side wall by said line of stitching and further secured to said side wall by spaced apart lines of adhesive extending parallel to but spaced above and below the line of stitching, said strip folded upon itself over the line of stitching and secured in place thereover by a longitudinal line of adhesive extending parallel to but spaced above the line of stitching and further adhesively secured in place by narrow spaced apart lines of adhesive extending from the fold line of the strip below the line of stitching to said longitudinal line of adhesion of the strip above the line of stitching.

5. A paper bag having side walls and an end closure comprising a sealer strip adhesively secured along the end of one side wall by a line of adhesive extending transversely of the bag spaced from the end thereof, said strip folded over the end of the bag and adhesively secured to the opposite side wall by a similarly positioned line of adhesive, said strip further adhesively secured in place by spaced apart lines of adhesive extending transversely of the strip from its said line of adhesion to the bag on one side wall to its said line of adhesion to the bag on the opposite side wall.

6. A paper bag having side walls secured together at one end by a line of stitching, a sealer strip secured in place over said line of stitching by narrow spaced-apart lines of adhesive extending transversely of the strip across said line of stitching, and lines of adhesive extending parallel to but spaced above and below the line of stitching and crossing said transverse lines of adhesive forming adhesively enclosed bulkhead portions along the line of stitching.

7. A paper bag having side walls secured together by a line of stitching, a sealer strip extending transversely across the bag covering said line of stitching, said sealer strip secured to the bag throughout its length on both sides of the line of stitching spaced from the line of stitching, said sealer strip further secured by a line of securement extending across each end of the strip between said lengthwise lines of securement, said sealer strip further secured to the bag by transverse lines of securement arranged at spaced apart intervals throughout its length between the two end lines of securement.

JOHN A. ROSMAIT. 

